going somewhere

helper/helper.go

@@ -1,6 +1,7 @@
 package helper
 
 import (
+	"crypto"
 	"errors"
 	"strings"
 )
@@ -21,3 +22,29 @@ func JoinErrors(errs []error) error {
 	}
 	return JoinAsError(msgs)
 }
+
+func GetHashFunctionByLowerCaseName(hashName string) (crypto.Hash, error) {
+	switch hashName {
+	case "md4":
+		return crypto.MD4, nil
+	case "md5":
+		return crypto.MD5, nil
+	case "sha1":
+		return crypto.SHA1, nil
+	case "sha224":
+		return crypto.SHA224, nil
+	case "sha256":
+		return crypto.SHA256, nil
+	case "sha384":
+		return crypto.SHA384, nil
+	case "sha512":
+		return crypto.SHA512, nil
+	case "md5sha1":
+		return crypto.MD5SHA1, nil
+	case "ripemd160":
+		return crypto.RIPEMD160, nil
+	default:
+		return 0, errors.New("unknown lowercase hash " + hashName)
+
+	}
+}